Mounting structure of pressure sensor element

Abstract

A pressure sensor can be mounted to an object with a pressure to be measured by a mounting structure. The mounting structure includes bonding a first member and a second member, a medium passageway formed on one of the bonding face thereof, a flexible printed wiring board interposed between both bonding faces through gaskets, and a pressure sensor element electrically connected to the flexible printed wiring board by an electrically conductive member so that the sensor element electrically connects to the outside of the object. The pressure sensor element is disposed in a recess that is formed on the bonding face. The presser medium is transferred through an introduction hole from the medium passageway to the pressure sensor element.

1. A mounting structure of a pressure element to be mounted to an object with a pressure to be measured, the object having a medium passageway from which a pressure medium is introduced to the pressure element, comprising:
 a first member of an object with a pressure to be measured, the first member having a first bonding face; 
 a second member of the object, the second member having a second bonding face, the first bonding face facing the second bonding face, a medium passageway being formed on at least one of the first and second bonding faces; 
 a flexible printed wiring board interposed between the first bonding face and the second bonding face; 
 a first gasket interposed between the first bonding face and the flexible printed wiring board; 
 a second gasket interposed between the second bonding face and the flexible printed wiring board, an opening portion being formed in the second gasket; 
 a pressure sensor element electrically connected to the flexible printed wiring board by an electrically conductive member through the opening portion, the pressure sensor element having an electrical connection to be connected to an outside of the object; 
 a recess formed on the second bonding face opposite to the pressure sensor element, the pressure sensor element being received in the recess or the opening portion of the second gasket; and 
 a medium introduction hole formed at least on one of the first gasket and second gasket, communicating the medium passageway to the pressure sensor element. 
 
   
   
     2. The mounting structure according to  claim 1 ,
 wherein the medium passageway is formed on the bonding face of the first member, 
 wherein the medium introduction hole is formed on the first gasket. 
 
   
   
     3. The mounting structure according to  claim 2 ,
 wherein the pressure sensor element includes a pressure receiving face, and the pressure receiving face faces the flexible printed wiring board, 
 wherein the medium introduction hole is formed on the first gasket, 
 wherein an opening portion is formed on the flexible printed wiring board communicating the medium introduction hole to the pressure receiving face. 
 
   
   
     4. The mounting structure according to  claim 1 ,
 wherein the medium passageway is formed on the second bonding face, 
 wherein the recess is formed in the medium passageway of the second member. 
 
   
   
     5. The mounting structure according to  claim 4 ,
 wherein the pressure sensor element includes a pressure receiving face, and the pressure receiving face is faces the flexible printed wiring board, 
 wherein an opening portion formed on the second gasket is used as the medium introduction hole for introducing the pressure medium from the medium passageway of the second member. 
 
   
   
     6. The mounting structure according to  claim 5 , wherein the electrically conductive member between the pressure sensor element and the flexible printed wiring board is sealed by insulating material. 
   
   
     7. The mounting structure according to  claim 1 , wherein the object is a control module for controlling oil pressure of an automatic transmission of a vehicle. 
   
   
     8. The mounting structure according to  claim 1 , wherein a perimeter of the medium introduction hole is coextensive with a perimeter of the opening. 
   
   
     9. The mounting structure according to  claim 1 , further comprising a plate between the first bonding face and the first gasket. 
   
   
     10. A method of measuring a pressure by a pressure sensor of a pressure medium in a medium passageway formed in an object installed in an engine, the presser sensor including a pressure element and a flexible printed wring board being connected to the pressure element, the object having a first member with a first bonding face and a second member with a second bonding face, the first bonding face facing the second bonding face, a medium passageway being formed on at least one of the first and second bonding faces, the method comprising:
 providing a flexible printed wiring board interposed between the first bonding face and the second bonding face; a first gasket interposed between the first bonding face and the flexible printed wiring board; a second gasket interposed between the second bonding face and the flexible printed wiring board, an opening portion being formed in the second gasket; a pressure sensor element electrically connected to the flexible printed wiring board by an electrically conductive member through the opening portion, the pressure sensor element having an electrical connection to be connected to an outside of the object; a recess formed on the second bonding face opposite to the pressure sensor element, the pressure sensor element being received in the recess; a medium introduction hole formed at least on one of the first gasket and second gasket, communicating the medium passageway to the pressure sensor element; 
 generating a pressure medium in the medium passageway in the automatic transmission; 
 receiving the pressure medium in the medium passageway from the opening portion, to a pressure receiving face on the pressure sensor element; and 
 generating, from the pressure sensor element, a pressure signal corresponding to a pressure of the pressure medium received at the receiving face. 
 
   
   
     11. The method according to  claim 10 ,
 wherein the medium passageway is formed on the second bonding face, wherein the pressure sensor is received in the medium passageway. 
 
   
   
     12. The method according to  claim 11 , wherein the object is an automatic transmission. 
   
   
     13. The method according to  claim 12 , wherein the medium passageway is a labyrinth of the automatic transmission, the pressure medium flowing through the labyrinth.